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Changes in Benefits Obligations and Plan Assets, Pension (Detail) - Pension Benefits - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | $ 591,948 | $ 589,046 |
Service cost | 37,859 | 37,603 | $ 32,808
Interest cost | 17,518 | 17,323 | 17,995
Benefits paid | (34,368) | (28,587) |
Actuarial (gains)/losses | 4,298 | (23,437) |
Benefit Obligation at End of Year | 617,255 | 591,948 | 589,046
Balance at Beginning of Period | 437,481 | 314,216 |
Actual return on plan assets | 30,291 | 44,924 |
Employer contributions | 53,829 | 106,928 |
Benefits paid | (34,368) | (28,587) |
Balance at End of Period | 487,233 | 437,481 | 314,216
(Deficit) of plan assets versus benefit obligations at end of year | (130,022) | (154,467) |
Net Amount Recognized | (130,022) | (154,467) |
Accumulated Benefit Obligation | 510,984 | 489,918 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | 195,884 | 187,064 |
Service cost | 4,620 | 4,070 | 4,061
Interest cost | 5,025 | 4,614 | 5,070
Benefits paid | (6,545) | (4,977) |
Participant contributions | 980 | 933 |
Plan amendments | (61) | (196) |
Plan settlements/curtailments | (2,984) | (4,546) |
Actuarial (gains)/losses | (9,523) | 16,697 |
Premiums paid | (106) | (109) |
Currency exchange rate changes | 6,859 | (7,666) |
Benefit Obligation at End of Year | 194,149 | 195,884 | 187,064
Balance at Beginning of Period | 179,928 | 169,464 |
Actual return on plan assets | 3,166 | 21,216 |
Employer contributions | 7,460 | 5,753 |
Participant contributions | 980 | 933 |
Benefits paid | (6,545) | (4,977) |
Plan settlements/curtailments | (2,267) | (4,471) |
Currency exchange rate changes | 6,344 | (7,881) |
Balance at End of Period | 188,960 | 179,928 | $ 169,464
(Deficit) of plan assets versus benefit obligations at end of year | (5,189) | (15,956) |
Net Amount Recognized | (5,189) | (15,956) |
Accumulated Benefit Obligation | $ 181,462 | $ 183,038 |

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